<template>
	<view class="compress__canvas">
		<!-- #ifndef H5 -->
		<canvas canvas-id="compress_canvas"  :style="{width: width + 'px', height: height + 'px'}"></canvas>
		<!-- #endif -->
	</view>
</template>

<script>
/**
 * 使用方法
 * import WCompress from '@/components/w-compress/compress.js'
 * components: { WCompress }
 * <w-compress ref='wCompress' />
 * this.$refs.wCompress.start(res.tempFilePaths[0]).then().catch()
 * this.$refs.wCompress.start(res.tempFilePaths).then().catch()
 */
import compress from './compress.js'
export default {
	name: 'wCompress',
	data() {
		return {
			width: 0,
			height: 0
		}
	},
	methods: {
		start(imgUrl, options={}) {
			return new Promise(async (resolve, reject) => {
				if(imgUrl instanceof Array) {
					try{
						let arr = []
						for(let i=0; i<imgUrl.length; i++) {
							let url = await compress(imgUrl[i], this, options)
							arr.push(url)
						}
						
						resolve(arr)
					}catch(e){
						reject(e)
					}
					
					/* let arr = []
					arr = imgUrl.map(async c => {
						return await compress(c, this, options)
					})
					resolve(arr) */
					
					/* let arr = imgUrl.map(c => {
						return compress(c, this, options)
					})
					
					Promise.all(arr)
						.then(resolve)
						.catch(reject) */
				} else {
					compress(imgUrl, this, options)
						.then(resolve)
						.catch(reject)
				}
			})
		}
	}
}
</script>

<style>
.compress__canvas {
	position: fixed;
	left: 10000rpx;
	top: 10000rpx;
	visibility: hidden;
	height: 0;
	overflow: hidden;
}
</style>
